Last official estimated population of Treasure County was 719 (year 2014)[1]. This was 0% of total US population and 0.1% of total Montana state population. Area of Treasure County is 984.3 mi² (=2549.2 km²), in this year population density was 0.73 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), Treasure County population in 2026 would be 722 [0].
Historical population of Treasure County for period 1920-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1920-1930] -1.79 %/yr
[1930-1940] -1.02 %/yr
[1940-1950] -0.67 %/yr
[1950-1960] -0.41 %/yr
[1960-1970] -2.27 %/yr
[1970-1980] -0.86 %/yr
[1980-1990] -1.15 %/yr
[1990-2000] -0.2 %/yr
[2000-2005] -2.22 %/yr
[2005-2010] -1.29 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in Treasure County? Visit this page: Settlements in Treasure County, MT
Population of Treasure County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 14 | 28 | 42 |
| 5 to 9 | 15 | 19 | 34 |
| 10 to 14 | 13 | 13 | 26 |
| 15 to 19 | 18 | 15 | 33 |
| 20 to 24 | 19 | 6 | 25 |
| 25 to 29 | 17 | 20 | 37 |
| 30 to 34 | 22 | 18 | 40 |
| 35 to 39 | 13 | 14 | 27 |
| 40 to 44 | 13 | 9 | 22 |
| 45 to 49 | 21 | 21 | 42 |
| 50 to 54 | 27 | 18 | 45 |
| 55 to 59 | 41 | 36 | 77 |
| 60 to 64 | 31 | 24 | 55 |
| 65 to 69 | 32 | 26 | 58 |
| 70 to 74 | 25 | 20 | 45 |
| 75 to 79 | 15 | 18 | 33 |
| 80 to 84 | 9 | 13 | 22 |
| 85+ | 15 | 14 | 29 |
Treasure County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| WAC | 355 | 318 | 673 |
| NH | 346 | 327 | 673 |
| WA | 347 | 310 | 657 |
| NHWAC | 341 | 314 | 655 |
| NHWA | 336 | 308 | 644 |
| IAC | 6 | 19 | 25 |
| NHIAC | 5 | 16 | 21 |
| H | 14 | 5 | 19 |
| HWAC | 14 | 4 | 18 |
| TOM | 8 | 8 | 16 |
| IA | 3 | 12 | 15 |
| NHIA | 3 | 11 | 14 |
| HWA | 11 | 2 | 13 |
| NHTOM | 5 | 6 | 11 |
| AAC | 6 | 2 | 8 |
| NHAAC | 4 | 2 | 6 |
| HTOM | 3 | 2 | 5 |
| HIAC | 1 | 3 | 4 |
| BAC | 2 | 1 | 3 |
| NHBAC | 2 | 1 | 3 |
| AA | 1 | 2 | 3 |
| NHAA | 1 | 2 | 3 |
| HAAC | 2 | 0 | 2 |
| BA | 1 | 0 | 1 |
| NHBA | 1 | 0 | 1 |
| HIA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| NAC | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| NHNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HBAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Yellowstone County population
51.3 mi, 
248°
• Big Horn County
56.6 mi, 
191°
• Custer County
82.7 mi, 
87°
• Rosebud County
29.5 mi, 94°
• Musselshell County
58.9 mi, 
290°
• Powder River County
99.8 mi, 
123°
• Prairie County
94.2 mi, 
63°
• Garfield County
75.3 mi, 
10°
• Golden Valley County
91.2 mi, 
277°
• Petroleum County
78.5 mi, 
325°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Rosebud Montana Notes
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